SkScaleToSides Class Reference

#include <SkScaleToSides.h>

Static Public Member Functions
static void	AdjustRadii (double limit, double scale, SkScalar *a, SkScalar *b)

Detailed Description

Definition at line 17 of file SkScaleToSides.h.

Member Function Documentation

AdjustRadii()

static void SkScaleToSides::AdjustRadii ( double  limit, double  scale, SkScalar *  a, SkScalar *  b  )

inlinestatic

Definition at line 23 of file SkScaleToSides.h.

                                                                                  {
        SkASSERTF(scale < 1.0 && scale > 0.0, "scale: %g", scale);
 
        *a = (float)((double)*a * scale);
        *b = (float)((double)*b * scale);
 
        if (*a + *b > limit) {
            float* minRadius = a;
            float* maxRadius = b;
 
            // Force minRadius to be the smaller of the two.
            if (*minRadius > *maxRadius) {
                using std::swap;
                swap(minRadius, maxRadius);
            }
 
            // newMinRadius must be float in order to give the actual value of the radius.
            // The newMinRadius will always be smaller than limit. The largest that minRadius can be
            // is 1/2 the ratio of minRadius : (minRadius + maxRadius), therefore in the resulting
            // division, minRadius can be no larger than 1/2 limit + ULP.
            float newMinRadius = *minRadius;
 
            float newMaxRadius = (float)(limit - newMinRadius);
 
            // Reduce newMaxRadius an ulp at a time until it fits. This usually never happens,
            // but if it does it could be 1 or 2 times. In certain pathological cases it could be
            // more. Max iterations seen so far is 17.
            while (newMaxRadius + newMinRadius > limit) {
                newMaxRadius = nextafterf(newMaxRadius, 0.0f);
            }
            *maxRadius = newMaxRadius;
        }
 
        SkASSERTF(*a >= 0.0f && *b >= 0.0f, "a: %g, b: %g, limit: %g, scale: %g", *a, *b, limit,
                  scale);
 
        SkASSERTF(*a + *b <= limit,
                  "\nlimit: %.17f, sum: %.17f, a: %.10f, b: %.10f, scale: %.20f",
                  limit, *a + *b, *a, *b, scale);
    }

---

The documentation for this class was generated from the following file:

• third_party/skia/src/core/SkScaleToSides.h